/Engine/Source/Runtime/Slate/Public/Framework/Text/ShapedTextCache.h
Find the character index at the specified position in pixels along the string horizontally
The index of the character closest to the specified horizontal offset
namespace ShapedTextCacheUtil { int32 ShapedTextCacheUtil::FindCharacterIndexAtOffset ( const FShapedTextCacheRef & InShapedTextCache, const [FCachedShapedTextKey](API\Runtime\Slate\Framework\Text\FCachedShapedTextKey) & InRunKey, const [FTextRange](API\Runtime\Core\Containers\FTextRange) & InTextRange, const TCHAR * InText, const int32 InHorizontalOffset ) }